Automatic brake



No Model.)

G. W. SANBORN.

AUTGMATIG BRAKE. K No. 339,698. Patented Apr. 13, 1886.

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AUTOMATIC BRAKE.

SPECIFICATION forming part of Letters Patent No. 339,698, dated April13, 1886.

Application filed February 15, 1886. Serial No. 191,937. (No model.)

To all whom zit may concern,.-

Be it known that I, GEORGE WILSON SAN- BORN, a citizen ofthe UnitedStates, residing at Lower Gilmanton, in the county of Belknap and Stateof New Hampshire, have invented certain new and useful Improvements inAutomatic Brakes; and I do declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to niake and use the same,reference being had to the accompanying drawings, and to the letters andfigures ofreferenee marked thereon, which form a part of thisspecification.

The special object of the invention is to automatically aetuate thebrakes of a wagon in going down hill by gravity and through theinstrumentality of a rocking bolster, asv hereinafter described.

Figure l of the drawings is a longitudinal vertical section of a wagonwith the brakes applied; Fig. 2, a similar view with the brakes notapplied; and Fig` 3 is a bottom view.

In the dra wings, A represents the front and B the rear axle ofafreight-wagon wherein no reach or springs are employed, while thebottom is secured by a king-bolt to the front bolster and axle. larrange on the bottoni of the wagon-body the two parallel keepers c c,in which is placed the fast block D, that is providedwitli a medianhole, d. Through the latter passes the rod E, to whose rear end ispivoted the middle of the brake-bar F, while the other end extendsforward between axle A and bolster G, where it is held by a pin, a. Thewagon-body has a short reciprocating niovenient'with the keepers c c onthe rod E, said movement being governed by the distance of thebrake-shoes f f from the rear wheels of the wagon when the latter is noton a declining grade. The bolster G is slightly beveled or chanifered onthe rear edge of the upper side and on the front edge of thelower side,so that when going down hill the bolster may rock on the head of bolta', and turn sufijciently to pnt on the brakes, as shown in Fig. 1 ofthe drawings. By this construetion and the use of the two bolts a a', Iam enabled to give the desired vibratory mot-ion to the rock er-bolsterG.

I am aware that the use of gravity to put on the brakes is not broadlynew.

I ain aware that an armed bar hinged to rear axle has been combined witha roller having arms connected with the brake-bar to operate the latter;also, that four shouldered and inclined blocks on the bottoni of wagonhave been combined with friction-rollers on the holsters of both frontand rear axles; also, that a roller trunnioned in keepers on the frontaxlehas been combined with a brake bar suspended from body and jointedbars to actnate the brakes; but none of these combine the sameinstrumental ities for operating the brakes when going down hill; but

What I do claim as new, and desire to secure by Letters Patent, is-

l. The combination,with a f1ontbolster,bev eled on the rear edge of theupper side and the front edge of the lower sida-of. the two bolts a a',connecting said bolster with the body and front axle of a wagon, as andfor the purpose specified.

2. The combination, in a wagon, of the `brake-bar F with the rod E,cross-block D, the

keepers c c, and the rocking bolster G, as and for the purpose setforth.

In testi xn ony whereof I afiix my signature in presence of twowitnesses.

GEORGE VILSON SANBOR.

Witnesses:

JOHN A. Goss, CLARA A. BATOHELDER.

